Increase the contrast of shadows like you would using a color ramp
You can use this setup to control the contrast of the shadows. In the image I provide, I mix the shadows with a texture, but you can use a color just the same. Also, because my example is for toon shading, I have the ColorRamp set to &quot;constant&quot;, you probably want something more like &quot;Linear&quot;, &quot;B-spline&quot;, or &quot;Ease&quot;. Lastly, the reason I multiplied it twice was to darken the shadows even further because they didn't turn out well in screenshots. Use as needed.